Intraocular pressure measurement system and method

Abstract

A system for measuring intraocular pressure (IOP). The system includes a tonometer head configured to measure IOP in a posterior chamber and a vitreous cavity of an eye. The system includes an optical gauge configured to measure corneal data of the eye. The system includes a compression arm-spread angle gauge configured to measure a dilation angle of compression arms. The system includes a processor configured to determine geometric parameters of the eye based on the measured corneal data and dilation angle, calculate physical parameters of a sclera of the eye based on the determined geometric parameters, and adjust the measured IOP based on the calculated physical parameters of the sclera.

What is claimed is: 
     
         1 . A system for measuring intraocular pressure (IOP), comprising:
 a tonometer head configured to measure IOP in a posterior chamber and a vitreous cavity of an eye;   an optical gauge configured to measure corneal data of the eye;   a compression arm-spread angle gauge configured to measure a dilation angle of compression arms; and   a processor configured to determine geometric parameters of the eye based on the measured corneal data and dilation angle, calculate physical parameters of a sclera of the eye based on the determined geometric parameters, and adjust the measured IOP based on the calculated physical parameters of the sclera.   
     
     
         2 . The system of  claim 1 , wherein the optical gauge comprises a keratometer configured to measure corneal curvature. 
     
     
         3 . The system of  claim 1 , wherein the optical gauge comprises a pachymeter configured to measure corneal thickness. 
     
     
         4 . The system of  claim 1 , wherein the compression arm-spread angle gauge is configured to measure the dilation angle when compression feet of the compression arms contact the eye at a predetermined distance from a corneal limbus. 
     
     
         5 . The system of  claim 4 , wherein the predetermined distance is between 3-5 mm posterior to the corneal limbus. 
     
     
         6 . The system of  claim 1 , further comprising an axial drive configured to maintain the optical gauge at a constant distance from a cornea of the eye during measurement. 
     
     
         7 . The system of  claim 1 , further comprising a camera configured to capture an image of an anterior surface of a lens of the eye to determine a degree of porosity of an anterior lens capsule. 
     
     
         8 . A method of measuring intraocular pressure (IOP), comprising:
 measuring IOP in a posterior chamber and a vitreous cavity of an eye using a tonometer;   measuring corneal data of the eye using an optical gauge;   
       measuring a dilation angle of compression arms using a compression arm-spread angle gauge;
 determining geometric parameters of the eye based on the measured corneal data and dilation angle; 
 calculating physical parameters of a sclera of the eye based on the determined geometric parameters; and 
 adjusting the measured IOP based on the calculated physical parameters of the sclera. 
 
     
     
         9 . The method of  claim 8 , wherein measuring the corneal data comprises measuring corneal curvature using a keratometer. 
     
     
         10 . The method of  claim 9 , wherein measuring the corneal data further comprises measuring corneal thickness using a pachymeter. 
     
     
         11 . The method of  claim 8 , wherein measuring the dilation angle comprises measuring the dilation angle when compression feet of the compression arms contact the eye at a predetermined distance from a corneal limbus. 
     
     
         12 . The method of  claim 11 , wherein the predetermined distance is between 3-5 mm posterior to the corneal limbus. 
     
     
         13 . The method of  claim 8 , further comprising maintaining an optical gauge at a constant distance from a cornea of the eye during measurement using an axial drive. 
     
     
         14 . The method of  claim 13 , further comprising capturing an image of an anterior surface of a lens of the eye to determine a degree of porosity of an anterior lens capsule. 
     
     
         15 . A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform a method of measuring intraocular pressure (IOP), the method comprising:
 receiving IOP measurements from a posterior chamber and a vitreous cavity of an eye;   receiving corneal data measurements of the eye;   receiving a dilation angle measurement of compression arms;   determining geometric parameters of the eye based on the received corneal data and dilation angle;   calculating physical parameters of a sclera of the eye based on the determined geometric parameters; and   adjusting the received IOP measurements based on the calculated physical parameters of the sclera.   
     
     
         16 . The non-transitory computer-readable medium of  claim 15 , wherein the corneal data measurements comprise corneal curvature and corneal thickness. 
     
     
         17 . The non-transitory computer-readable medium of  claim 15 , wherein the method further comprises receiving an image of an anterior surface of a lens of the eye. 
     
     
         18 . The non-transitory computer-readable medium of  claim 17 , wherein the method further comprises determining a degree of porosity of an anterior lens capsule based on the received image. 
     
     
         19 . The non-transitory computer-readable medium of  claim 15 , wherein calculating the physical parameters of the sclera comprises determining a thickness, axial stiffness, and bending stiffness of the sclera. 
     
     
         20 . The non-transitory computer-readable medium of  claim 19 , wherein adjusting the received IOP measurements comprises applying a correction factor based on the determined thickness, axial stiffness, and bending stiffness of the sclera.